866717995249 has 8 divisors (see below), whose sum is σ = 876500299080. Its totient is φ = 856936667136.

The previous prime is 866717995243. The next prime is 866717995303. The reversal of 866717995249 is 942599717668.

It can be written as a sum of positive squares in 4 ways, for example, as 35351520400 + 831366474849 = 188020^2 + 911793^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 866717995249 - 2¹⁹ = 866717470961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866717995243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1622817 + ... + 2089729.

It is an arithmetic number, because the mean of its divisors is an integer number (109562537385).

Almost surely, 2^866717995249 is an apocalyptic number.

866717995249 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

866717995249 is a deficient number, since it is larger than the sum of its proper divisors (9782303831).

866717995249 is a wasteful number, since it uses less digits than its factorization.

866717995249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487859.

The product of its digits is 411505920, while the sum is 73.

The spelling of 866717995249 in words is "eight hundred sixty-six billion, seven hundred seventeen million, nine hundred ninety-five thousand, two hundred forty-nine".